Suffolk County and Islip Town property record for 5 William Ave, Islip, NY 11751 · Last verified August 2026
| Property Type | Single Family Home |
|---|---|
| Details | 1,276 sqft · built 1959 |
| Lot Size | 0.34 acres (14,810 sqft) |
| Owner | 2 Individual Names on File |
| Last Sale | $345,000 (Apr 2018) |
| Tax Bill | $11,950 (2024) |
| Deeds & Mortgages | Mar 2022 Refinance Apr 2018 Sale |
| Flood Zone | Zone X (minimal risk) |
| APN | 472889 345.-1-6 |
| Primary APN | 472889 345.-1-6 |
|---|---|
| Alternative APNs |
|
| Building Area | 1,276 sqft Living Area |
|---|---|
| 1st Floor Area | 1,276 sqft |
| Year Built | Built 1959 |
|---|---|
| Effective Year Built | Effective 1959 |
| Lot Area | 14,810 sqft (0.34 acres) |
| Lot Width | 100 ft Width |
| Garage Type | Attached |
| Garage Area | 462 sqft |
| Account Number | 567180 |
|---|---|
| Street Address | 5 WILLIAM AVE |
| City | ISLIP |
| State | NY |
| Zip | 11751-2715 |
| Property Category | Residential |
| Property Type | Residential > Single Family > Home |
| Legal Description | X2218754Y187211 T044H00000000 |
| Legal Subdivision | COLOMBUS PK NO4 |
| Legal Block | 5000 |
| Legal Lot Number | 100 |
| Jurisdiction | SUFFOLK NY |
| Township / Civil Division | ISLIP |
| Census Block Group | 1 |
| Census Block | 1015 |
| Census Tract | 147401 |
Source: Suffolk County and Islip Town records · APN 472889 345.-1-6
Assessment roll updated August 11, 2026 · Last verified August 2026
Owner names and exact recorded amounts shown locked on this page are available instantly with a free trial.
| Owner of Record | 2 Individual Names on File |
|---|---|
| Mailing Address | 5 WILLIAM AVE, ISLIP, NY 11751-2715 |
| Occupancy | Owner Occupied |
| Owner Type | Individual |
| Date | Document |
|---|---|
| Mar 28, 2022 | Deed of Trust, Mortgage · Stand-Alone Refinance TEACHERS FCU |
| Apr 02, 2018 | Deed, Transfer |
| Deed Names | 2 Verified Names on Deed |
|---|---|
| Last Sale | Apr 02, 2018 · Amount on Record |
| Deed Sale | Apr 02, 2018 · Amount on Record |
| Deed Book / Page | 12956 / 75 |
| Prior Transfer Date | Oct 24, 2016 |
| Prior Transfer Doc | 0128860894 |
| Record Updated | Sep 20, 2026 |
| Document Type | Deed of Trust |
|---|---|
| Jurisdiction | SUFFOLK NY |
| Property Address | 5 WILLIAM AVE, ISLIP, NY 11751-2715 |
| Transaction Type | Mortgage |
| Record Updated | Jun 21, 2022 |
| Name | Verified Name |
|---|
| Document Number | 0233970952 |
|---|---|
| Date | Mar 28, 2022 |
| Book Page | 23397/952 |
| Instrument | DM073915 |
| Name | TEACHERS FCU |
|---|---|
| Type | Credit Union |
| Type | Stand-Alone Refinance |
|---|---|
| Amount | Amount Recorded |
| Term | 349 Months |
| Due | Apr 01, 2051 |
| Document Type | Deed |
|---|---|
| Jurisdiction | SUFFOLK NY |
| Recording Date | Apr 02, 2018 |
| Property Address | 5 WILLIAM AVE, ISLIP, NY 11751-2715 |
| Document Number | 0129560075 |
| Book / Page | 12956 / 75 |
| Instrument Date | Mar 01, 2018 |
| Transaction Type | Transfer |
| Record Updated | Aug 20, 2021 |
| Amount | Amount Recorded |
|---|---|
| Tax | $0.00 |
| Amount Accuracy | Full Amount Stated |
| Additional |
|
| Name | Verified Name |
|---|
| Name | Verified Name |
|---|---|
| Address | 18 OLEAN ST, ISLIP TERRACE, NY 11752-1612 |
Source: Suffolk County and Islip Town records · Assessment roll updated August 11, 2026 · Last verified August 2026
| Type | Name |
|---|---|
| State | New York |
| County | Suffolk County |
| County Subdivision | Islip Town |
| Unified School District | Islip Union Free School District (KG - 12) |
Assessed value and assessed market value are set for property tax purposes, not market price estimates; both are a fraction of this property's market value.
| Year | Tax Bill | Assessed Value | Assessed Market Value |
|---|---|---|---|
| 2025 | $37,100 (-) Land $7,800 Building $29,300 | $522,535 (-) Land $109,859 Building $412,676 | |
| 2024 | $11,950.00 | $522,535 (+2.54%) Land $109,859 Building $412,676 | |
| 2023 | $37,100 Land $7,800 Building $29,300 | $509,616 Land $107,143 Building $402,473 |
Source: FEMA National Flood Hazard Layer, Suffolk County (36103C), updated September 18, 2026 · USDA Forest Service Wildfire Risk to Communities, 2nd edition (2024), fuels as of 2020 · Last verified October 2026
| FEMA Flood Zone | Zone X |
|---|---|
| Flood Hazard | Minimal |
| 500-Year Floodplain | No |
| Special Flood Hazard Area | No |
| Wildfire Risk | Not rated no burnable land in reach |
|---|---|
| Wildfire Likelihood | Negligible |
| Exposure | None beyond ember reach |
Values are read at the parcel center point; lenders make the official flood determination.
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